CVE-2023-1456
📋 TL;DR
CVE-2023-1456 is a post-authentication command injection vulnerability in Ubiquiti EdgeRouter X's NAT Configuration Handler. Attackers with administrative access can execute arbitrary commands on the router. This affects EdgeRouter X users with the vulnerable firmware version.
💻 Affected Systems
- Ubiquiti EdgeRouter X
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing persistent backdoor installation, network traffic interception, and lateral movement to connected devices.
Likely Case
Attackers with stolen or default credentials gain full control of the router to modify configurations, intercept traffic, or use as pivot point.
If Mitigated
Limited to authenticated attackers only, with proper credential management preventing exploitation.
🎯 Exploit Status
Exploit requires administrative credentials. Public disclosure increases weaponization likelihood.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available - vendor does not consider post-authentication issues vulnerabilities
Restart Required: No
Instructions:
No official patch available. Consider upgrading to latest firmware version if available.
🔧 Temporary Workarounds
Restrict Administrative Access
linuxLimit administrative access to trusted IP addresses only
configure
set service gui listen-address <trusted_ip>
commit
save
Disable Unused NAT Features
linuxDisable NAT configuration features if not required
configure
delete service nat
commit
save
🧯 If You Can't Patch
- Change all default administrative credentials to strong, unique passwords
- Implement network segmentation to isolate the router from critical internal systems
🔍 How to Verify
Check if Vulnerable:
Check firmware version: show version | grep VersionCheck Version:
show version | grep VersionVerify Fix Applied:
Verify firmware is updated beyond 2.0.9-hotfix.6 or workarounds are implemented📡 Detection & Monitoring
Log Indicators:
- Unusual NAT configuration changes
- Multiple failed login attempts followed by successful login
- Commands executed via NAT configuration interface
Network Indicators:
- Unexpected outbound connections from router
- Unusual traffic patterns from router management interface
SIEM Query:
source="edgerouter" AND (event="nat_config" OR event="command_execution")